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import abc |
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import asyncio |
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import inspect |
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import typing |
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from .. import errors, utils |
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__all__ = ( |
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'BaseJsonRpcMethod', |
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'JsonRpcMethod', |
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) |
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class BaseJsonRpcMethod(abc.ABC): |
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name: str |
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func: typing.Union[typing.Callable, typing.Type] |
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separator: str = '__' |
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def __init__(self, |
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prefix: str, |
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func: typing.Union[typing.Callable, typing.Type], *, |
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custom_name: typing.Optional[str] = None) -> None: |
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assert callable(func) |
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self.func = func |
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self.name = custom_name if custom_name else func.__name__ |
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if prefix: |
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self.name = f'{prefix}{self.separator}{self.name}' |
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@abc.abstractmethod |
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async def __call__(self, args: list, kwargs: dict, extra_args: typing.Optional[dict] = None) -> typing.Any: |
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pass |
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class JsonRpcMethod(BaseJsonRpcMethod): |
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add_extra_args: bool |
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is_coroutine: bool |
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is_class: bool |
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supported_args: list |
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supported_kwargs: list |
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prepare_result: typing.Optional[typing.Callable] |
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def __init__(self, |
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prefix: str, |
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func: typing.Union[typing.Callable, typing.Type], *, |
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custom_name: typing.Optional[str] = None, |
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add_extra_args: bool = True, |
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prepare_result: typing.Optional[typing.Callable] = None) -> None: |
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super().__init__(prefix, func, custom_name=custom_name) |
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self.add_extra_args = add_extra_args |
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self.prepare_result = prepare_result |
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self._inspect_func() |
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async def __call__(self, args: list, kwargs: dict, extra_args: typing.Optional[dict] = None) -> typing.Any: |
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if self.add_extra_args and extra_args: |
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args, kwargs = self._add_extra_args_in_args_and_kwargs(args, kwargs, extra_args) |
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self._check_func_signature(args, kwargs) |
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if self.is_coroutine: |
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result = await self.func(*args, **kwargs) |
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else: |
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result = self.func(*args, **kwargs) |
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if self.prepare_result: |
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result = self.prepare_result(result) |
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return result |
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def _inspect_func(self) -> None: |
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self.is_class = inspect.isclass(self.func) |
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func = self.func.__init__ if self.is_class else self._unwrap_func(self.func) |
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argspec = inspect.getfullargspec(func) |
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if self.is_class or inspect.ismethod(func): |
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self.supported_args = argspec.args[1:] |
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else: |
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self.supported_args = argspec.args |
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self.supported_kwargs = argspec.kwonlyargs |
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self.is_coroutine = asyncio.iscoroutinefunction(func) |
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@staticmethod |
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def _unwrap_func(func: typing.Callable) -> typing.Callable: |
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i = 0 |
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while hasattr(func, '__wrapped__'): |
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func = func.__wrapped__ |
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i += 1 |
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if i > 1_000: |
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raise errors.InternalError('The method has too many wrappers.') |
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return func |
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def _add_extra_args_in_args_and_kwargs(self, |
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args: list, |
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kwargs: dict, |
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extra_args: dict) -> typing.Tuple[list, dict]: |
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if not extra_args: |
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return args, kwargs |
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new_args = self._add_extra_args_in_args(args, extra_args) |
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if (len(new_args) - len(args)) == len(extra_args): |
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return new_args, kwargs |
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new_kwargs = self._add_extra_kwargs_in_args(kwargs, extra_args) |
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return new_args, new_kwargs |
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def _add_extra_args_in_args(self, args: list, extra_args: dict) -> list: |
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new_args = [] |
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for supported_arg in self.supported_args: |
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if supported_arg not in extra_args: |
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break |
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new_args.append(extra_args[supported_arg]) |
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if new_args: |
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args = [*new_args, *args] |
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return args |
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def _add_extra_kwargs_in_args(self, kwargs: dict, extra_args: dict) -> dict: |
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new_kwargs = {} |
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for extra_arg, value in extra_args.items(): |
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if extra_arg in self.supported_kwargs: |
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new_kwargs[extra_arg] = value |
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if new_kwargs: |
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kwargs = {**kwargs, **new_kwargs} |
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return kwargs |
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def _check_func_signature(self, args: list, kwargs: dict) -> None: |
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try: |
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if self.is_class: |
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inspect.signature(self.func.__init__).bind(None, *args, **kwargs) |
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else: |
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inspect.signature(self.func).bind(*args, **kwargs) |
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except TypeError as e: |
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raise errors.InvalidParams(utils.get_exc_message(e)) from e |
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expert-m /
aiohttp-rpc
